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JOINT FLEET MAINTENANCE MANUAL

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1. Radio Communication:<br />

APPENDIX E<br />

I-4E-1<br />

COMFLTFORCOMINST 4790.3 REV A CH-3<br />

ESCORT SHIP CAPABILITIES FOR SUBMARINE SEA TRIALS<br />

a. Ability to transmit and receive on two Ultrahigh Frequency (UHF) and on High Frequency (HF) circuits<br />

simultaneously including 243.0 MHZ or equivalent system capabilities (Very High Frequency (VHF)<br />

and INMARSAT-C).<br />

b. Equipped to tape record all non-secure radio transmissions between the submarine and the escort.<br />

c. Capability to communicate on the submarine UHF/HF or equivalent system capabilities<br />

(VHF/INMARSAT-C) circuits.<br />

2. Sonar and Sonar Communications:<br />

a. Equipped with underwater telephone capable of communicating to the submarine's test depth or<br />

equivalent system capabilities.<br />

b. Sufficient operators to man underwater telephone on a continuous basis, including a Continuous Wave<br />

(CW) capable operator on call if the requirement for CW communication develops.<br />

c. Equipped to tape record (installed or portable) all transmissions between the submarine and the escort<br />

by underwater telephone.<br />

d. Explosive charge signals or active sonar called for by AXP-1.<br />

3. Navigation:<br />

a. Equipped with an operable LORAN C, Global Positioning System (GPS) or the latest accurate off-theshelf<br />

navigational equipment.<br />

b. Equipped with an operable DRT or equivalent system capability.<br />

c. Possess navigational capability to fix his position to two miles average accuracy.<br />

d. Fathometer.<br />

e. Gyrocompass.<br />

f. Underwater log or equivalent system capability.<br />

4. Sea keeping and speed:<br />

a. Ability to remain at sea for one week in State 6 seas.<br />

b. Be capable of making 10 knots. Escorts will keep the submarine informed of any speed or sea state<br />

limitations. In addition, if the escort has an unfaired WQC hydrophone, it shall notify the submarine of<br />

the maximum sea state and speed which will not restrict WQC communications. If the submarine<br />

requires a speed above this limit, the submarine should run a track about the escort within WQC range.

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